Combined roasting and smelting furnace.



W. R. HBSLBWOUD. COMBINED ROASTING AND SMBLTING FURNAGE.

APPLICATION FILED MARy 9, 1914.

1,121,559, Patented Dec. 15,1914.

'ITNESSES: I.\' Y PINTOR WILLIAM R. Hnsnnwoon, on OAKLAND,

CALIFoRNIAASSIGNon 'ro HYDRO VACUUM SMELTING- CO., OF OAKLAND,CALIFORNIA, A CORPORATION OF (J.ALIFOIRJ.\1IA.

COMBINED ROASTING AND-SMELTING FURNACE.

To all whom it may concern.'

Be it known that I, WILLIAM R. H nsnns woon, a citizen of the UnitedStates, residing atOakland, in the county of Alameda and State ofCalifornia. have invented new and useful Improvements in CombinedRoasting and Smelting Furnaces, of which the following is aspecification.

This invention relates to improvements in a combined roasting andsmelting furnace. One of the objects of the invention is to provide asimple, substantial, easily o erated furnace of the character describein which the ores to be smelted may be desulfurized and deoxidizedbefore it is entered into the fusion zone of the smelting chamber.

. Another object of the invention is to providel means for conveying theheated gases discharging from the furnace to the'roasting chamber for-the purpose of heating` the roasting chamber.

Another object is to provide means for distributing the gases evenlythroughout the ore within the roasting "chamber,

Further objects will hereinafter appear.

i The invention consists of the parts and the construction andcombination of part as yhereinafter more fully described and claimed,having reference to the accompanying drawings, in which Figure 1 is avertical longitudinal section. Fig. 2 isa cross section on line ww,Fig. 1. Fig. 3 is an end view of one of the twyer openings,l showing theposition of the damper.

v Referring to the drawings, A indicates a smelting furnace or cupola,of suitable cross section and height, constructed of fire-brick or likematerial, which is provided with an upper and lower set of twyeropenings 2 and 3. Suitably supported' above the chamber A is an oreroastin receptacle B, and connecting same with t e furnace A is a pipe 4having a valve 5 mounted in its lower end through which the volume ofore fed to the lower smelting chamber may be controlled. Surrounding theroasting chamber is a series of'vertically positioned pipes 6 whichconnect with the top of chamber A at their lower ends, and at theirupper ends with the roasting chamber through a series of pipes 7, ineach of which is mounted a controlling valve 8. The upper end of theroasting chamber is connected, through a Specification of LettersPatent.

Application filed March 9, 1914. Serial No. 823,358.

pipe 9, with a feed hopper not here shown, and a valve 10 is provided atthis point for the purpose of closing the upper end of the roastingchamber and also for the purpose -as indicated at 12, and the connectionbetween the two is controlled by a damper or valve 18 of suitableconstruction. The particular type of furnace, indicated at A, isprovided with angularly disposed twyers, as shown, and is particularlyconstructed for use in connection with oil burners of suitableconstruction, indicated at 14, and the openings of the twyers arepreferably controlled by dampers 15 as shown in Fig. 3.

In operation, the roasting chamber is first chargedV with ore throughpipe 9 and valve. 10. A fire is then started in the burners 14, in thelower twyer openings, and the heat thus generated is conveyed throughpipes 6 and distributed through the connections 7 throughout the orewithin chamber B. rl`hel ore is here treated until it is completelydesulfurized. if sulfurous ores are being treated, or until itiscompletely deoxidized, when iron 4ores or the like are being handled.Valve 5 is then opened to permit chamber A to b completely charged. Theore is then directly acted on by the flame di scharging through thelower twyersand isv here melted and collected in a well in the usualmanner. .Y

The upper twyers are used for severall purposes, first. to increase theheat of the gases discharging from the smelting chamber for the purposeperature within the roasting chamber: and, second, for the purpose ofadding carbon to the gases thus discharging, when necessary. It oftenhappens that the carbon admitted to the zone of fusion through'the lowertwyers is entirely consumed. It is, therefore, an advantage in someinstances to inject more carbon or other gases through the uppertwyers.v The upper twyersy are also used for emergency cases, that is,if the lower twyers should happen to freeze up it would be possible touse Ithe upper twyers to of increasing the temf ing furnace, a pluralityof clear the furnace. The 'connection formed between pipes 6 and 11 atl2 permits a portion or all'of the gases to be by-passed withoutentering the roasting chamber, while the several connections formedbetween pipes 6 and the roasting chamber permit a perfect distributionof the heated gases through the ores contained therein. Valves 8provided at these points add greatly to produce a uniform result.

A furnace constructed and arrangedv in the manner shown is simple inconstruction and the regulation of the gases passing through theroasting chamber may be perfectly controlled; the temperature andquality of same being regulated to a more or less degree by the upperset of twyers as above described.

.The materials and arrangements of the several parts of the furnace aresuch as the4 experience and judgment of the manufacturerI may dictate.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a furnace of the character described, theycombination of a smelting furnace, a roasting furnace, means forconveying the heated gases discharging from the smelting furnace to theroasting furnace, means for distributing the gases evenly throughout theore within the roasting furnace, an upper and lower set of twyers formedin the smelting furnace, and dampers in said twyers.

2. In a furnace of the character described, the combination of asmelting furnace, a roasting furnace mounted above the smeltpipesconnecting the roasting furnace with the smelting furnace, a pipeconnecting the two furnaces through which the ore may be fed, and avalve in said pipe.

3. In a furnace of the character described, the combination of asmelting furnace, a roasting furnace mounted above the smelting furnace,a plurality of pipes connected at their lower ends with the smeltingfurnace, a plurality of connections formed-be- `of said connections,

tween the upper end of each of said pipes and the roasting furnace, andmeans for conveying the ore from the roasting furnace to the smeltingfurnace.

4. In a furnace of the character described, the combination of asmelting furnace, a roasting furnace mounted above the smelting furnace,a plurality of pipes connected at their lower ends with the smeltingfurnace, a plurality of connections formed between the upper end of eachof said pipes and the roasting furnace, a valve in each andA means forconveying the ore from the roasting furnace to the smelting furnace.

5. In a furnace of the character described, the combination of asmelting furnace, a roasting furnace, means for conveying the heatedgases discharging from the smelting furnace to the roasting furnace,means for distributing the gases evenly throughout the ore within theroasting furnace, and means including valves in the connecting passagesfor regulating the temperature and mixture of the gasesl passing throughthe roasting furnace.

6. In a furnace of the character described, the combination of asmelting furnace, a roasting furnace mounted above the smelting furnace,a plurality of pipes connected at their lower ends with the smeltingfurnace, a plurality of connections formed between the upper end of eachof said pipes and the roasting furnace, means for conveying the orefromthe roasting furnace to the smelting furnace, a discharge pipe connectedwith the roasting furnace, and means for by-passing a portion or all ofthe heated gases coming from the smelting furnace to said pipe.

In testimony whereof'I have hereunto set l my hand in the presence oftwo subscribing Witnesses.

WILLIAM R. HESLEWOOD.

Witnesses:

THos. F. GRABER, J. A. HEsLEwooD.

